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Cabral, Diogo
Publications (4 of 4) Show all publications
Costeira, J., Vieira, M., Hayati, A., Gomes, J. & Cabral, D. (2018). Development of a compact and didactic solar energy kit using Arduino. In: Haberle, A. (Ed.), PROCEEDINGS OF THE ISES EUROSUN 2018 CONFERENCE - 12TH INTERNATIONAL CONFERENCE ON SOLAR ENERGY FOR BUILDINGS AND INDUSTRY: . Paper presented at 12th International Conference on Solar Energy for Buildings and Industry (ISES EuroSun), 2018, Rapperswil, SWITZERLAND (pp. 1663-1667). INTL SOLAR ENERGY SOC
Open this publication in new window or tab >>Development of a compact and didactic solar energy kit using Arduino
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2018 (English)In: PROCEEDINGS OF THE ISES EUROSUN 2018 CONFERENCE - 12TH INTERNATIONAL CONFERENCE ON SOLAR ENERGY FOR BUILDINGS AND INDUSTRY / [ed] Haberle, A., INTL SOLAR ENERGY SOC , 2018, p. 1663-1667Conference paper, Published paper (Refereed)
Abstract [en]

When the sun rises, so does the key element that will shape the future of the world energy landscape. It is not an understatement to say that the solar energy industry is beginning to lead the path towards a sustainable future for all of us. However, the awareness of the potential of this amazing source of energy must begin from the most basic levels of education all the way to university. The scope of this paper is to display a new compact and didactic solar energy kit with the potential to replace current high cost and complex solar energy kits. These solutions are often too expensive and therefore unavailable for most of Europe’s public schools. As such, an equipment was developed using an open-source platform called Arduino that will enable students to conduct practical experiments in a fast, effective and simple manner and thus allow students to acquire the proper expertise in areas like energy, electronics, and programming.

Place, publisher, year, edition, pages
INTL SOLAR ENERGY SOC, 2018
Keywords
Photovoltaic (PV) cells; Solar energy; Teaching kit; Active learning; Arduino
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:hig:diva-30564 (URN)10.18086/eurosun2018.07.04 (DOI)000475550900174 ()
Conference
12th International Conference on Solar Energy for Buildings and Industry (ISES EuroSun), 2018, Rapperswil, SWITZERLAND
Available from: 2019-08-23 Created: 2019-08-23 Last updated: 2019-08-23Bibliographically approved
Cabral, D., Costeira, J. & Gomes, J. (2018). Electrical and Thermal Performance Evaluation of a District Heating System Composed of Asymmetric low concentration PVT Solar Collector Prototypes. In: Haberle, A. (Ed.), PROCEEDINGS OF THE ISES EUROSUN 2018 CONFERENCE - 12TH INTERNATIONAL CONFERENCE ON SOLAR ENERGY FOR BUILDINGS AND INDUSTRY: . Paper presented at 12th International Conference on Solar Energy for Buildings and Industry (ISES EuroSun), 2018, Rapperswil, SWITZERLAND (pp. 755-763). INTL SOLAR ENERGY SOC
Open this publication in new window or tab >>Electrical and Thermal Performance Evaluation of a District Heating System Composed of Asymmetric low concentration PVT Solar Collector Prototypes
2018 (English)In: PROCEEDINGS OF THE ISES EUROSUN 2018 CONFERENCE - 12TH INTERNATIONAL CONFERENCE ON SOLAR ENERGY FOR BUILDINGS AND INDUSTRY / [ed] Haberle, A., INTL SOLAR ENERGY SOC , 2018, p. 755-763Conference paper, Published paper (Refereed)
Abstract [en]

Photovoltaic-Thermal (PVT) solar collectors generate electricity and heat from the same gross area. The annual electrical and thermal yields of these systems are dependent on the PVT collector technology, as well as the climate and the type of solar thermal system implemented. This review presents an evaluation of a district heating system composed of 20 asymmetric hybrid low concentrator PVT (C-PVT) solar collector prototypes. The system is installed in a South wall facade in order to maximise the available space (with a tilt of 20 degrees and an orientation of 5 degrees W). The thermal system is connected to the district heating network, thus heating the University buildings. On the other hand, the electrical system is grid-connected, where it feeds the grid directly. Real measurement data has been collected and compared with a thermal (through ScenoCalc tool) and electrical performance models. The annual thermal and electrical yield achieved 86% and 89% of the simulated thermal and electrical yield, respectively.

Place, publisher, year, edition, pages
INTL SOLAR ENERGY SOC, 2018
Keywords
C-PVT; System analysis; Electrical and Thermal evaluation
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:hig:diva-30563 (URN)10.18086/eurosun2018.02.15 (DOI)000475550900080 ()
Conference
12th International Conference on Solar Energy for Buildings and Industry (ISES EuroSun), 2018, Rapperswil, SWITZERLAND
Available from: 2019-08-23 Created: 2019-08-23 Last updated: 2019-08-23Bibliographically approved
Cabral, D. & Karlsson, B. O. (2018). Electrical and thermal performance evaluation of symmetric truncated C-PVT trough solar collectors with vertical bifacial receivers. Solar Energy, 174, 683-690
Open this publication in new window or tab >>Electrical and thermal performance evaluation of symmetric truncated C-PVT trough solar collectors with vertical bifacial receivers
2018 (English)In: Solar Energy, ISSN 0038-092X, E-ISSN 1471-1257, Vol. 174, p. 683-690Article in journal (Refereed) Published
Abstract [en]

One way to reduce solar collectors’ production costs is to use concentrators that increase the output per photovoltaic cell. Concentrating collectors re-direct solar radiation that passes through an aperture into an absorber/receiver. Symmetrical truncated non-tracking C-PVT trough collectors based on a parabola and compound parabolic concentrator (CPC) geometries have been developed. The collector type has a central vertical bifacial (fin) receiver and it was optimized for lower latitudes. In this paper, the electrical and thermal performance of symmetric truncated non-tracking low concentrator PVT solar collectors with vertical bifacial receivers is analysed, through a numerical ray-tracing model software and a multi-paradigm numerical computing environment. A thermal (quasi-dynamic testing method for liquid heating collectors described in the international standard for solar thermal collectors ISO 9806:2013) and electrical performance models were implemented to evaluate the design concepts. The evaluation was made for heating Domestic Hot Water for a Single Family House in Fayoum (Egypt), where CPC geometries with a concentration factor of 1.6 achieved 8 to 13%rel higher energy yields (in kWh/m2/year) than the Pure Parabola geometries.

Place, publisher, year, edition, pages
Elsevier Ltd, 2018
Keywords
Bifacial receiver, Electrical and thermal yield evaluation, Ray-tracing, Symmetric C-PVT collector
National Category
Energy Systems
Identifiers
urn:nbn:se:hig:diva-28322 (URN)10.1016/j.solener.2018.09.045 (DOI)000451499500065 ()2-s2.0-85053808056 (Scopus ID)
Available from: 2018-10-15 Created: 2018-10-15 Last updated: 2019-01-07Bibliographically approved
Cabral, D., Gomes, J., Dostie-Guindon, P.-A. & Karlsson, B. O. (2017). Ray tracing simulations of a novel low concentrator PVT solar collector for low latitudes. In: ISES Solar World Congress 2017 - IEA SHC International Conference on Solar Heating and Cooling for Buildings and Industry 2017, Proceedings: . Paper presented at SWC 2017: ISES Solar World Congress, SHC 2017: IEA SHC Solar Heating and Cooling Conference 2017; 29 October - 2 November 2017, Abu Dhabi, UAE (pp. 1068-1079). International Solar Energy Society
Open this publication in new window or tab >>Ray tracing simulations of a novel low concentrator PVT solar collector for low latitudes
2017 (English)In: ISES Solar World Congress 2017 - IEA SHC International Conference on Solar Heating and Cooling for Buildings and Industry 2017, Proceedings, International Solar Energy Society , 2017, p. 1068-1079Conference paper, Published paper (Refereed)
Abstract [en]

One way to reduce solar collector's production costs is to use concentrators that increase the output per photovoltaic cell. Concentrating collectors re-direct solar radiation that passes through an aperture into an absorber. The current study evaluates electrical performance of symmetric C-PVT solar collectors with a vertical bifacial receiver, through a numerical ray tracing model software, Tonatiuh. Several designs have been analysed, such as the Pure Parabola (PP) and MaReCo CPC geometries, both symmetric. Parameters such as concentration factor, electrical performance, transversal and longitudinal IAM (Incidence Angle Modifier), the influence of optical elements and influence of the length of the reflector in the shadow effect have been studied for different geometries. The simulations were performed for Mogadishu, Somalia and showed good results for the Pure Parabola collector (PPc) annual received energy, 379 and 317 kWh/m2/year for a focal length of 15 e 30 mm, respectively. A symmetrical double MaReCo CPC collector has been simulated with the annual received energy of 315 kWh/m2/year. The addition of the optical elements will decrease the annual received energy of the PPc by around 11.5%, where the optical properties (7.1%) and glass (4.1%) have the biggest impact in the annual received energy. Overall, symmetric geometries proved to be the most suitable geometries for low latitudes applications, being the geometry f1 (focal length of 15 mm) the best one. 

Place, publisher, year, edition, pages
International Solar Energy Society, 2017
Keywords
MaReCo CPC geometry, Pure Parabola collector, Symmetric C-PVT, Tonatiuh, C (programming language), Geometry, Optical properties, Photoelectrochemical cells, Photovoltaic cells, Rhenium compounds, Solar collectors, Solar heating, Solar power generation, Solar radiation, Concentrating collector, Concentration factors, Direct solar radiation, Electrical performance, Ray tracing simulation, Ray tracing
National Category
Energy Systems
Identifiers
urn:nbn:se:hig:diva-27631 (URN)10.18086/swc.2017.18.05 (DOI)2-s2.0-85050544604 (Scopus ID)978-3-9814659-7-6 (ISBN)
Conference
SWC 2017: ISES Solar World Congress, SHC 2017: IEA SHC Solar Heating and Cooling Conference 2017; 29 October - 2 November 2017, Abu Dhabi, UAE
Available from: 2018-08-13 Created: 2018-08-13 Last updated: 2018-08-13Bibliographically approved
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